JP2001059545A - Vibration damping device for cable, tubular body or rod- like body and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the damping function of a vibration damping device incorporating an elastic vibration absorber for absorbing vibration of cable or the like, and to prevent the physical property of the vibration damper from lowering in comparison with the conventional one by enhancing the adherence of the vibration absorber with respect to the cable of the like. SOLUTION: This vibration damping device comprises a pair of halves 60a, 60b which are cylindrically coupled together so as to surround a cable or the like, and which are fixed to a stationary part, and fastening means 35a to 35d for fastening and fixing the pair of cylindrically coupled halves 60a, 60b together. Each of the pair of halves 60a, 60b is composed of an outer cover 61a, 61b incorporating a semi-cylindrical body arranged in parallel with the outer peripheral surface of the cable or the like, and a vibration absorber packed in the semi-cylindrical body and having a concave groove 74a, 74b fitted on the outer peripheral surface of the cable or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vibration of a cable stretched between a bridge girder of a suspension bridge or a cable-stayed bridge and a main cable or a tower above the bridge girder, or of a column of a lighting lamp erected on the bridge girder. The present invention relates to a vibration damping device that attenuates vibration and the like, and is also applicable to a case where a vibration of a piping pipe that sends a fluid at a factory or the like is attenuated.

[0002]

2. Description of the Related Art FIG. 7 is a sectional view of a conventional example of a cable damping device stretched between a tower of a cable-stayed bridge and a bridge girder.

[0003] At the upper end of the base (15), a lower half (5
2) are connected in series, and the base (15) is
7) (17) fixed to the bridge girder (13). Also, the lower half (5
The upper half (51) combined cylindrically with
8) At (18) linked to the lower half (52).

A cable (22) is inserted into a cylinder (5) connecting the upper half (51) and the lower half (52).
A vibration absorber (11) made of an elastic material such as polybutadiene rubber is interposed between the cable (22) and the cylindrical body (5). The gap between the outer periphery of the cable (22) and the peripheral edges of both ends of the cylindrical body (5) is covered with conical protective covers (24, 24).

Next, the installation work of the bridge cable vibration damping device will be described. In this case, the base (1
5) is fixed with fixing bolts (17) (17), and the upper half (51) is connected to the lower half (52) of the upper end of the base (15) with the connecting bolts (18) (18), The cable (22) is inserted into the center of the cylinder (5) composed of the lower half (52) and the upper half (51). Next, as shown by the imaginary line in FIG. 7, the space between the inner peripheral portions of both ends of the cylindrical body (5) and the cable (22) is closed with the closing lids (19) and (19).
An elastic material having fluidity (for example, polybutadiene rubber) is injected from the injector (26) into the inside. Then, when the elastic material naturally hardens, it becomes a vibration absorber (11) and is interposed between the cable (22) and the cylindrical body (5).

In this case, since the cable (22) vibrates until the elastic material injected into the cylinder (5) hardens, a gap is formed at the boundary between the vibration absorber (11) and the cable (22). Is easily formed, and the vibration absorber is provided over the entire outer periphery of the cable (22).
It is highly possible that (11) does not adhere. Therefore, in the above-described conventional device, there is a problem that the vibration suppression performance of the cable (22) is reduced due to the presence of the gap.

The uncured elastic material injected into the cylinder (5) is gradually cured while being stirred by the vibrating cable (22). There is also a problem that the physical properties of the vibration absorber (11) deteriorate.

[0008] In the above, the cable (2
Although the problem was pointed out while exemplifying the case where the vibration damping device is applied to 2), the same applies to the case where the vibration damping device is used to attenuate vibration of a tubular body or the like described below. There is a problem. That is, a tubular body or a rod-shaped body serving as a pillar of an illumination lamp erected on a highway or a bridge girder also vibrates due to strong wind. In the case of attenuating the vibration of the column of the lighting lamp, a vibration damping device having a vibration absorber (11) surrounding the base end of the column may be provided.In such a case, the vibration absorber ( When the elastic material to be 11) is filled on site, the column vibrates until the elastic material is hardened, so that a gap is easily formed at the boundary between the column and the vibration absorber (11), There are inconveniences. In addition, even when the vibration damping device is used to suppress the vibration of a fluid piping pipe in a factory or the like that vibrates due to the flow of the fluid, there is the same disadvantage as described above. [Invention of vibration suppression device]

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made in consideration of "a vibration made of an elastic material which absorbs vibration of a cable or the like by closely adhering to the entire outer periphery of a cable or a tubular body or a rod-shaped body. In the vibration damping device provided with an absorber, the vibration absorber (11) has improved adhesion to cables and the like to improve the vibration damping performance, and the vibration absorber (11 The object of the present invention is to make it possible to prevent the deterioration of the physical properties of (1).

[0010]

Means for Solving the Problems <A1> The technical means of the present invention for solving the above-mentioned problem is that "the cable is assembled into a cylindrical shape as a whole so as to surround the cable, etc. A pair of halves fixed to another fixing portion, and a tightening means for tightening and fixing the pair of halves to each other in a state where the halves are combined into the cylindrical shape, wherein each of the halves is the cable And an outer cover having a semi-cylindrical body disposed in parallel with the outer peripheral surface of the vibration absorber, and a concave groove filled inside the semi-cylindrical body and closely fitted to the outer periphery of the cable or the like. When the pair of halves are externally fitted to the cable or the like at the concave groove portion and tightened by the tightening means in a direction in which the two halves approach each other, the circumference of the concave groove is The cable or the like is compressed on the surface. "

[0011] The fixed portion is, for example, a bridge girder when the present invention is applied to a vibration damping device for a cable for a bridge, or a road surface when the present invention is applied to a vibration damping device such as a support of a road lighting lamp. When the present invention is applied to a vibration damping device that suppresses vibration of a fluid piping pipe, it means a building or a building near the piping pipe, respectively, and the location of the fixing portion is not particularly limited.

The above technical means operates as follows. The vibration damping device of the present invention is assembled on site after being manufactured in a factory in advance. When assembling in the field, these halves are combined in a cylindrical shape so that the concave grooves formed in the pair of halves of the vibration absorber are externally fitted to the outer periphery of the cable or the tubular or rod-shaped body to be damped. In this state, when the respective halves are tightened and connected to each other by the tightening means, the outer circumference of the cable or the like is pressed by the circumferential surface of the concave groove formed in the vibration absorber. As a result, the vibration damping device of the present invention is coupled to the cable or the tubular or rod-shaped body to be damped.

In order that the outer periphery of a cable or the like can be pressed by the peripheral surface of the concave groove of the vibration absorber when the two halves are tightened by the tightening means, the double concave groove after the tightening is used. The thickness of the cylindrical space to be formed is set to be slightly smaller than the thickness of the cable or the like to be damped, so that the concave groove of each half can be forcibly fitted to the cable or the like. be able to. Therefore, not only the configuration in which the cross-sectional size of the cylindrical space formed by the pair of concave grooves is smaller than the thickness of the cable or the like before the fastening by the fastening means but also the following configuration can be adopted. . That is, even if the cross-sectional size of the cylindrical space formed by the pair of concave grooves is equal to or slightly larger than the thickness of the cable or the like before the fastening by the fastening means, the following two items will be described. The above-mentioned compression can be made possible by adopting a configuration in which the vibration absorber has a raised area protruding in the circumferential direction from both ends of the semi-cylindrical body in the circumferential direction. According to this configuration, each of the halves having the raised area formed in the vibration absorber is externally fitted to a cable or the like at the portion of the concave groove, and tightened by the tightening means in a direction in which the two halves approach each other. In this case, the raised region of one half and the raised region of the other half are pressed against each other to compressively deform the vibration absorber, and the compressive deformation compresses the cable or the like on the peripheral surface of the concave groove. Is done.

<A2> In the above item 1, the "vibration absorber may include a raised area protruding in the circumferential direction from both circumferential ends of the semi-cylindrical body, and the pair of halves may be formed in the concave shape. When the two halves are fitted to the cable or the like at the groove portion and fastened by the fastening means in a direction to approach the two halves, the raised area of one half and the raised area of the other half are mutually In this case, the halves are combined into a cylindrical shape so that the concave grooves formed in the pair of halves of the vibration absorber are externally fitted to the outer periphery of the cable or the tubular body or the rod body to be damped. Then, the raised area of the vibration absorber protruding from the circumferential both ends of one half in the circumferential direction and the raised area of the vibration absorber protruding from the circumferential ends of the other half are brought into abutting state. . In this state, when the halves are fastened to each other by the fastening means, the butt boundaries of the raised areas are brought into pressure contact with each other and the two halves are integrated. When the halves are tightened by the tightening means and the raised areas in the abutted state are pressed against each other, the raised areas are deformed so as to be pushed into the respective half cylinders. Then, the vibration absorber having elasticity is elastically deformed as a whole, and the peripheral surface of the groove formed in the vibration absorber is more securely pressed against the cable or the like.

<A3> In the above item 1 or 2,
In the case where the vibration absorber protrudes from one end of the semi-cylindrical body in the axial direction and the protruding end face is inclined upward with respect to the horizontal when installed at the site, When a pair of halves are fitted over each other and these halves are connected to each other by tightening means, an end surface of the semi-cylindrical body in the vibration absorber that protrudes from one end in the axial direction is directed upward with respect to a horizontal plane. Incline. Therefore, the rainwater flows and drains along the inclined end surface, so that there is no inconvenience that the rainwater accumulates on the upper surface of the vibration damping device.

<A4> In the above items 1 to 3, "the vibration absorber is made of polybutadiene rubber"
If so, it was confirmed that a remarkable effect of attenuating vibration of a cable or the like was obtained.

[0017]

The present invention has the following specific effects. Since a vibration damping device consisting of a pair of halves manufactured in advance in a factory is assembled and installed on site, a fluid elastic material that becomes a vibration absorber around a vibrating cable or a tubular or rod-shaped body This eliminates the risk of forming a gap at the boundary between the vibration absorber and the cable or the like as compared with the above-described conventional one in which the vibration absorber is injected, thereby improving the adhesion of the vibration absorber to the cable or the like.

For the same reason, the uncured elastic material does not harden while being agitated by a vibrating cable or the like unlike the above-described conventional one, and the vibration absorption after the hardening is harder than that of the above-described conventional one. Physical properties of the body can be improved. [Invention of a method for manufacturing a vibration damping device] An object of the present invention is to provide a method suitable for manufacturing the vibration damping device according to the above A1.

[0019]

Means for Solving the Problems <B1> The technical means for solving the above-mentioned problem is as follows: a center shaft having an outer surface substantially coincident with an outer circumferential surface of a cable or a tubular body or a rod-like body; An intermediate partition member having a pair of projecting plates projecting in opposite directions, and a pair of outer covers having a pair of fastening flanges projecting radially outward from both circumferential ends of the semi-cylindrical body are provided. The pair of outer covers are placed on a work surface such that the inner surfaces of the pair of semi-cylindrical bodies are opposed to each other to form a cylinder whose central axis faces upward, and the pair of semi-cylindrical bodies are in the opposed state. Interposing the intermediate partition member between the outer covers so that the center axis extends vertically at the centers of the cylindrical bodies, and the inner surface of the semi-cylindrical body in each of the outer covers and the middle Surrounded by partition members A step of pouring an elastic material having fluidity into the pair of semi-cylindrical spaces, a step of spontaneously curing the poured elastic material, and a step of removing the partition member after the step of spontaneously curing. '' That is.

In this device, the pair of outer covers are placed on the work surface such that the inner surfaces of the respective semi-cylindrical bodies provided on the pair of outer covers are opposed to each other to form a cylinder whose central axis is directed upward. The middle partition member is interposed between the outer covers so that the center axis of the middle partition member extends up and down at the center between the pair of semi-cylindrical bodies in the opposed state.

Next, when a flowable elastic material is poured into a pair of semi-cylindrical spaces surrounded by the pair of outer covers and the intermediate partition member and left to stand, the elastic material hardens, and the elastic material is cured. And so on.
At this time, the vibration absorber has a concave groove which is fitted to the cable or the like at a portion corresponding to a center axis of the partition member.

After the vibration absorber has been formed, the partition member is removed to complete the vibration damping device. <B2> The method according to the above B1, wherein in the step of interposing the intermediate partition member, a flat spacer is provided between each of the fastening flanges of each of the outer covers and the protruding plate of the intermediate partition member. In this case, a raised area is formed in which the vibration absorber projects in the circumferential direction from both circumferential ends of the semi-cylindrical body by the thickness of the spacer. Therefore, when the pair of halves are externally fitted to a cable or the like and tightened, the raised areas are pressed against each other and deformed so that the raised areas are pushed into the semi-cylindrical body of the outer cover. A vibration damping device having a structure in which the peripheral surface of the concave groove formed in the body is pressed against a cable or the like can be manufactured.

[0023]

Next, embodiments of the present invention will be described. FIG. 1 is an exploded perspective view of a vibration damping device for a bridge cable embodying the present invention. The vibration damping device for a bridge cable according to the present embodiment is composed of a pair of halves (60a) and (60b) combined in a cylindrical shape as a whole, and these halves (60a) and (60b) are mutually connected. It has a plane-symmetric structure.

Next, the structure of one half (60b) will be described. The half body (60b) has an outer cover (6
1b) and a thick vibration absorber (73b) provided along the inner surface of the semi-cylindrical body (43b),
The vibration absorber (73b) is formed with a concave groove (74b) having a substantially semicircular end face that is fitted to a cable (22) described later.
The vibration absorber (73b) slightly protrudes from the upper end of the semi-cylindrical body (43b), and its protruding end face (70b) has a semi-cylindrical body (43b).
Are inclined so as to be non-perpendicular to the axis of. When installed on the site, the protruding end surface (70b) is slightly inclined with respect to the horizontal so that the rainwater on the protruding end surface (70b) is drained naturally.
b) In order to prevent rainwater from staying in the area. The vibration absorber (73b) is formed with raised areas (75) (75) projecting in the circumferential direction from both circumferential ends of the outer cover (61b) (see FIGS. 1 and 4). [Explanation of each member used for manufacturing a vibration damping device for a bridge cable] FIG. 5 is an exploded perspective view of each member used for manufacturing a vibration damping device for a bridge cable according to the present embodiment.

When manufacturing the above halves (60a) and (60b),
As shown in FIG. 5, a partition member (71) including a pair of projecting plates (72) (72) projecting in opposite directions from the outer periphery, and a half body (60a).
(60b) outer cover (61a) (61b) and the outer cover (61a) (6
1b) and spacers (41) (41) interposed between the projecting plates (72) (72) of the intermediate partition member (71), and further, the outer cover (61a)
(61a) Semi-cylindrical auxiliary cover (31a) (31b)
Use

* Middle partition member (71) The middle partition member (71) has a center shaft (76) having an outer surface substantially coincident with the outer circumferential surface of a cable (22) described later, and a direction opposite to the outer periphery of the center shaft (76). Protruding plates (72) and (72) that protrude from the main body. One side of the protruding plates (72) and (72) is welded to the outer peripheral surface of the metal cylinder (78) forming the center of the center shaft (76) so as to extend along the axial direction thereof, and the protruding plate ( The through holes (59) and (59) are formed in the 72 and 72 at intervals. Further, surface layers (79) (79) each having an end surface formed in a semi-elliptical shape are bonded to the outer periphery of the metal cylinder (78). Therefore, the central axis
The outer surface shape of (76) is an elliptical cylindrical shape that is slightly flat in the direction in which the protruding plates (72), (72) protrude.

The dimensions of the outer peripheral shape of the elliptical cylinder are appropriately set, whereby the surface layers (79) and (79)
The groove (74a) of the vibration absorber (73a) (73b)
a) The shape of (74b) is such that the pair of halves (60a) (60b) are connected to the final position by connecting bolts (35a) to (35d) and connecting nut (36a).
~ (36d) in the state where they are tightened and connected to each other.
(75) (75) is in a state where it is completely compressed), so that it becomes smaller than the thickness of the cable (22).

* Outer Covers (61a) (61b) Since the outer covers (61a) and (61b) have the same structure, only the structure of one outer cover (61b) will be described.

The outer cover (61b) has a semi-cylindrical body (43b) and a base plate (45b) welded to the lower end thereof, and the base plate (45b) is formed inside the semi-cylindrical body (43b). A semicircular cutout (46) is formed at a portion protruding from the periphery, and a through hole (47) (47) is formed at a portion where the base plate (45b) protrudes from the outer periphery of the semicylindrical body (43b). ) Is drilled. Also, outer cover (61b)
A pair of fastening flanges (48b) (48b) projecting outward in the radial direction are welded to both ends in the circumferential direction. These fastening flanges (48b) (48b) have fastening holes (59) (59) corresponding to the through holes (59) (59) formed in the projecting plates (72) (72) of the intermediate partition member (71). 49) and (49) are formed.

Auxiliary cover (31a) (31b) Auxiliary cover (31a) fitted externally to semi-cylindrical body (43a) (43b) of outer cover (61a) (61b) during manufacture of half body (60a) (60b) ) (31
b) is formed in a semi-cylindrical shape as a whole, and its axial length is set to be larger than the axial length of the semi-cylindrical bodies (43a) and (43b). Also, the auxiliary cover (3
1a) On both sides in the circumferential direction of (31b), the cover (61a)
Notch for external fitting engagement with fastening flange (48a) (48b) of (61b)
(40) and (40) are formed.

* During the manufacture of the spacer (41) half (60a) (60b), the projecting plate (7
2) (72) and outer cover (61a) (61b) tightening flange (48a) (4
8b) The spacers (41) and (41) interposed therebetween are formed of a rectangular metal plate, and the spacers (41) and (41) have the above-described through holes.
Through holes (42) (42) corresponding to (59) (59) and the fastening holes (49) (49) are formed. [Explanation of Manufacturing Operation] Next, an operation of manufacturing a vibration damping device for a bridge cable using the above members will be described.

As shown in FIG. 5, the outer covers (61a) and (61b) face each other with the middle partition member (71) therebetween, and the projecting plates (72) and (72) of the middle partition member (71) and the outer cover Spacers (41) and (41) are interposed between the fastening flanges (48a) and (48b) of (61a) and (61b), and the outer covers (61a) and (61b) are brought together in this state. Then, the semi-cylindrical body of the outer cover (61a) (61b) (43a) (4
3b) is abutted across the middle partition member (71) to form a cylinder as a whole, and is tightened by the fastening flanges (48a) (48b) of the outer covers (61a) (61b). The projecting plates (72) and (72) of the intermediate partition member (71) are spacers (41) and (41).
It becomes a state pinched through. At this time, the fastening holes (49) (49) formed in the fastening flanges (48a) (48b) of the outer covers (61a) (61b) and the through holes (42) of the spacers (41) (41) )
(42) and the outer covers (61a) (61b) so that the through holes (59) (59) formed in the projecting plates (72) (72) of the intermediate partition member (71) respectively match.
And so on. With this, the outer cover in the facing state
The semi-cylindrical bodies (43a) and (43b) of (61a) and (61b) are in a state where the center shaft (76) of the partition member (71) is arranged in a vertically extending posture at the center of each other. Next, the fastening flanges (48a) (48b) of the outer covers (61a) (61b), the spacers (41) (41), and the middle partition member
The connecting bolts (35a) to (35d) are inserted into the fastening holes (49), through holes (42) and through holes (59) formed in the protruding plate (72) of Thread the coupling nuts (36a) to (36d) into place. As a result, the outer covers (61a) (61b) and the intermediate partition member (71) are connected with the connecting bolts (35a) to (35d) and the connecting nut (36).
a) It becomes a state of being united and integrated by (36d), whereby the step of interposing the intermediate partition member (71) between the outer covers (61a) and (61b) is completed.

Next, a release agent for preventing an elastic material (99) described later from adhering to the surface layer (79) of the intermediate partition member (71) and the surfaces of the protruding plates (72) and (72). Or a release paper is adhered thereto, thereby performing a release treatment.

Subsequently, the outer cover (61
a) Auxiliary covers (31a) and (31b) are fitted around the outer circumference of (61b), and the outer circumferences of these auxiliary covers (31a) and (31b) are bound and integrated with a binding band (27) and the like (see FIG. 2). Next, as shown in FIG. 2, the work bottom plate (38) is superimposed on the lower surface of the base plates (45a) (45b) at the lower ends of the outer covers (61a) (61b) in the above connected state. Base plate (45a) (45b) and work bottom plate
(38) is fixed with a holding tool (not shown) or the like. Next, the joined body of the outer covers (61a) and (61b) to which the work bottom plate (38) is fixed is placed on the work surface (29) as shown in FIG. A lifting plate (28) is inserted under one side, so that the combined body such as the outer covers (61a) (61b) is slightly inclined with respect to the horizontal work surface (29) (see FIG. 2
reference).

Next, as shown by the imaginary line in FIG. 2, the semi-cylindrical bodies (43a) and (43b) of the outer covers (61a) and (61b) and the center axis of the middle partition member (71) coaxially therewith. An elastic material (99) such as polybutadiene rubber having fluidity is poured into the semi-cylindrical space formed between the semi-cylindrical bodies (43) and (43) of the outer covers (61a) and (61b). The elastic material (99) is filled to a position slightly higher than the upper end, and in this state, the elastic material (99) is naturally cured. Then, the semi-cylindrical body (43a) of the outer cover (61a) (61b)
(43b) The protruding end (9
1) is formed, and the center axis of the cylindrical space formed by the semi-cylindrical bodies (43a) and (43b) of the outer covers (61a) and (61b) is the upper end surface (70a) of the protruding end (91). 70b). Outer cover (61a) (61b) by inserting lifting plate (28) under one side of work bottom plate (38)
This is because the elastic material (99) is filled and hardened in a state where the aggregate such as is entirely inclined.

Next, the semi-cylindrical body (4) of the outer covers (61a) (61b)
3a) After the elastic material (99) filled in (43b) is naturally cured, the binding band (27) and the connecting bolts (35a) to (35d) are removed, and the auxiliary covers (31a) (31b) and the partition The member (71) is removed. Then, as shown in FIG. 1, the semi-cylindrical body (43a) (43
b) with a vibration absorber (73a) (73b) attached inside (60)
a) (60b) is completed.

In this case, the fastening flanges (48a) (48b) of the outer covers (61a) (61b) and the projecting plate (72) of the middle partition member (71) are provided.
Elastic material with spacers (41) and (41) interposed between (72)
Went from the filling operation of the (99), FIG. 1 the outer cover (61a) (61b) in the circumferential direction circumferential direction in the vibration absorber from both ends of the (73a) (73b) protrudes, such raised area in FIG. 4 ( 75) and (75) are formed. [Installation work] Next, the installation work of the vibration damping device for the bridge cable composed of the halves (60a) and (60b) will be described.

As shown in FIG. 3 and FIG. 6, an installation base is provided so as to surround the base end of the cable (22) extending upward from the bridge girder (13).
Assemble (20) and place the half on the mounting table (20).
(60a) Hold cable (22) with (60b). That is, half (6
0a) Groove of vibration absorber (73a) (73b) provided in (60b)
Hold the cable (22) with (74a) and (74b) and face the fastening holes (49) (49) formed in the fastening flanges (48a) (48b) of the outer covers (61a) (61b). Then, connecting bolts (35a) to (35d) serving as tightening means are inserted into these tightening holes (49) and (49), and connecting nuts (36a) to (36d) are screwed to the ends thereof. Then, the raised area (75) (75) of one vibration absorber (73a)
The butted portions of the raised areas (75) and (75) of the other vibration absorber (73b) are pressed and deformed by compression, whereby the butted portions come into close contact with each other. In addition, the raised area (75)
By the compressive deformation of (75), the vibration absorbers (73a) and (73b) are entirely compressed and deformed, whereby the concave grooves (74a) and (74b)
The outer periphery of the cable (22) is reliably pressed on the peripheral surface of the cable. still,
Groove before tightening the connecting bolts (35a) to (35d) etc.
(74a) The size of the cylindrical space formed by (74b) and the cable
There is no limitation on the size of (22). However, the connection bolts (35a) to (35d) etc. are completely tightened and the raised area (75) (7
When 5) is completely compressed, the diameter of the cylindrical space in the groove (74a) (74b) (the diameter when the cable (22) is not inserted into the cylindrical space) is equal to the diameter of the cable (22). It is necessary to set the height of the raised grooves (74a, 74b) and the raised areas (75, 75) so as to be smaller than the diameter.

As shown in FIG. 3, the halves (60a) and (60b)
From the through holes (47) (47) formed in the base plates (45a) (45b), a plurality of mounting holes ( Insert the fixing bolts (55) into each of the 57) and mount the halves (60a) (60b) with the nuts (56).
Fix to (20).

Then, as shown in FIG. 6, the base end of the cable (22) hanging down from the main cable (23) of the suspension bridge is connected to the half body (60).
a) The bridge cable of (60b) according to the present embodiment is held by the vibration damping device (A). When the cable (22) vibrates in this state, the vibration absorbers (73a) (73b) of the half bodies (60a) (60b) holding the cable (22) are compressed and deformed by the cable (22), and Vibration is absorbed.

In this case, since the protruding end faces (70a) (70b) protruding from the axial ends of the outer covers (61a) (61b) are inclined with respect to the horizontal plane, the protruding end faces (70a) ( 70b)
The upper rainwater is easily drained, and the rainwater does not accumulate on the protruding end surfaces (70a) (70b).

In the above-described embodiment, the case where the present invention is applied to a vibration damping device for a bridge cable has been described as an example. However, a tubular member serving as a pillar of an illuminating lamp erected on a highway or a bridge girder is described. The present invention is also applicable to a vibration damping device for attenuating the vibration of a body or a rod. That is, an installation table (20) is disposed on the road surface at the base end of the illumination lamp, and a vibration damping device (A) is disposed on a mounting plate (21) of the installation table (20). Damping device (A)
The outer periphery of the base end of the illumination lamp is held by the vibration absorbers (73a) and (73b).

In a factory or the like, the outer circumference of a pipe for sending a fluid can be held by the above-mentioned halves (60a, 60b), whereby the vibration of the pipe can be attenuated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a vibration damping device for a bridge cable according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a manufacturing operation of the vibration damping device for a bridge cable according to the embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing an installation state of a vibration damping device for a bridge cable according to an embodiment of the present invention.

FIG. 4 is an end view of a half body (60a) (60b).

FIG. 5 is an exploded perspective view of each member used for manufacturing the vibration damping device for a bridge cable according to the embodiment of the present invention.

FIG. 6 is a partial side view of a suspension bridge to which the bridge cable damping device according to the embodiment of the present invention is applied.

FIG. 7 is an explanatory view of a conventional example.

[Explanation of symbols]

 (22) ・ ・ ・ Cable (41) ・ ・ ・ Spacer (48a) (48b) ・ ・ ・ Tightening flange (60a) (60b) ・ ・ ・ Half body (61a) (61b) ・ ・ ・ Outer cover (71 ) ・ ・ ・ Intermediate partitioning member (73a) (73b) ・ ・ ・ Elastic absorber (74a) (74b) ・ ・ ・ Concave groove (75) ・ ・ ・ Protrusion

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 000210838 Nakai Shoko Co., Ltd. 3- 15-16 Nakamichi, Higashi-Nari-ku, Osaka-shi, Osaka No.Honshu-Shikoku Communication Bridge Public Corporation Nagaohashi Technical Center (72) Inventor Takashi Tamakoshi 751-2 Yamaji, Imabari-shi, Ehime Prefecture Honshu-Shikoku Communication Bridge Public Corporation Third Management Bureau Imabari Management Office 1-3-18, Wakihamacho, Ward Kobe Steel, Ltd. (72) Inventor Shinsuke Yamazaki 2-6-3, Otemachi, Chiyoda-ku, Tokyo New Nippon Steel Corporation (72) Inventor Mitsumasa Maruta Higashisei, Osaka Nakai Shoko 3-15-16 Nakai Shoko Co., Ltd. (72) The inventor Naoki Hamasaki 3-15-16 Nakamichi Higashisei Ward, Osaka City Nakai Shoko Co., Ltd. F-term ( Reference) 2D059 AA41 BB06 BB08 GG12 3J048 AA01 BA19 DA06 EA29

Claims (6)

[Claims] 1. A vibration damping device comprising a vibration absorber made of an elastic material which is in close contact with the entire outer periphery of a cable, a tubular body or a rod-like body and absorbs vibration of the cable or the like, wherein the vibration absorber surrounds the cable or the like. A pair of halves combined into a cylindrical shape as a whole and fixed to a fixing portion different from the cable or the like, and a tightening to tighten and fix the pair of halves to each other in the cylindrical shape Means, an outer cover having a semi-cylindrical body disposed in parallel with the outer peripheral surface of the cable or the like, and each half is filled inside the semi-cylindrical body and the cable or the like. A vibration absorber having a concave groove externally fitted to the outer periphery, wherein the pair of halves is externally fitted to the cable or the like at the concave groove portion, and the tightening is performed in a direction in which the two halves approach each other. When tightened by the attaching means, Cables is squeezed, the vibration damping device of the cable or the tubular body or rod-shaped body. 2. The vibration damping device for a cable, a tubular body, or a rod-shaped body according to claim 1, wherein the vibration absorber has a raised area protruding in the circumferential direction from both circumferential ends of the semi-cylindrical body. When the pair of halves are externally fitted to the cable or the like at the concave groove portions and fastened by the fastening means in a direction to approach both halves, the raised area of one half is A cable or tubular or rod-shaped damping device, wherein the raised areas of the and the other half are pressed against each other. 3. The vibration damping device according to claim 1, wherein the vibration absorber protrudes from one axial end of the semi-cylindrical body and is installed at the site. A cable or a tubular or rod-shaped vibration damping device in which the protruding end face is inclined with respect to the horizontal in an upright state in a deflected state. 4. The vibration damping device according to claim 1, 2 or 3, wherein said vibration absorber is made of polybutadiene rubber. 4. The vibration damping device according to claim 1, wherein said vibration absorber is made of polybutadiene rubber. . 5. A semi-cylindrical body, comprising: a middle shaft having an outer surface substantially coinciding with an outer circumferential surface of a cable or a tubular body or a rod-like body; and a middle partition member having a pair of projecting plates projecting in opposite directions from the outer periphery of the middle shaft. A pair of outer covers each having a pair of fastening flanges protruding outward in the radial direction from both ends in the circumferential direction are prepared. A cylinder whose central axis faces upward by facing the inner surfaces of the pair of semi-cylindrical bodies. The pair of outer covers are placed on a work surface such that a pair of semi-cylindrical bodies in the opposed state are positioned so that the center axis extends vertically. Interposing the intermediate partition member between the outer covers; and pouring an elastic material having fluidity into a pair of semi-cylindrical spaces surrounded by the inner surface of the semi-cylindrical body and the intermediate partition member in each of the outer covers. Process and before A step of naturally hardening the cast but elastic material, manufacturing method of the vibration damping device of the cable or the tubular body or rod-shaped body comprising a step of removing the partition member after the natural cured to process. 6. The method of manufacturing a cable or a tubular or rod-shaped vibration damping device according to claim 5, wherein the step of interposing the intermediate partition member includes the steps of: A method of manufacturing a cable or a tubular or rod-shaped vibration damping device, wherein a flat spacer is interposed between the protruding plates in the intermediate partition member.